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JCR 2016
جستجوی مقالات
یکشنبه 30 آذر 1404
فرآیند و کارکرد گیاهی
، جلد ۱۳، شماره ۶۱، صفحات ۱-۸
عنوان فارسی
چکیده فارسی مقاله
The main focus of the present study was to better understand the effects of altitudinal gradient factors on the photochemical processes as reflected in changes in fast chlorophyll a fluorescence kinetics and related biophysical parameters in low and high-elevation ecotypes of
Dracocephalum kotschyi
and
Nepeta crassifolia
(located in Mazandaran, adjacent Central Alborz mountain range, central-northern part of Iran). In both
Dracocephalum kotschyi
and
Nepeta crassifolia
,
high-
altitude plants exhibited higher fluorescence parameters as compared to low-altitude plants, which was coupled with higher levels of carotenoids, suggesting
proper functioning of PSII.
Increased photochemical activity in high-altitude plants was achieved by increased levels of the activity of the oxygen-evolving complex (F
v
/F
o
),
the performance index (PI
abs
) and
the quantum yield for electron transport (φE
o
).
In addition, a clear increase in the relative amplitude of the IP (F
m
) phase from the OJIP curve was observed in
high-
altitude plants as compared to low-altitude plants. These results indicated a significant variation in the performance of chlorophyll
a fluorescence parameter,
between low- and high-altitude plants, which is apparently due to eco-physiological differences in relation to their altitudinal distributions.
Summarizing,
high-
altitude
plants have developed a series of mechanisms
with respect to photosynthetic apparatus efficiency
to protect themselves from adverse environmental
threats.
کلیدواژههای فارسی مقاله
عنوان انگلیسی
Performance of chlorophyll a fluorescence parameters in Dracocephalum kotschyi and Nepeta crassifolia plants growing at low and high altitudes
چکیده انگلیسی مقاله
The main focus of the present study was to better understand the effects of altitudinal gradient factors on the photochemical processes as reflected in changes in fast chlorophyll a fluorescence kinetics and related biophysical parameters in low and high-elevation ecotypes of
Dracocephalum kotschyi
and
Nepeta crassifolia
(located in Mazandaran, adjacent Central Alborz mountain range, central-northern part of Iran). In both
Dracocephalum kotschyi
and
Nepeta crassifolia
,
high-
altitude plants exhibited higher fluorescence parameters as compared to low-altitude plants, which was coupled with higher levels of carotenoids, suggesting
proper functioning of PSII.
Increased photochemical activity in high-altitude plants was achieved by increased levels of the activity of the oxygen-evolving complex (F
v
/F
o
),
the performance index (PI
abs
) and
the quantum yield for electron transport (φE
o
).
In addition, a clear increase in the relative amplitude of the IP (F
m
) phase from the OJIP curve was observed in
high-
altitude plants as compared to low-altitude plants. These results indicated a significant variation in the performance of chlorophyll
a fluorescence parameter,
between low- and high-altitude plants, which is apparently due to eco-physiological differences in relation to their altitudinal distributions.
Summarizing,
high-
altitude
plants have developed a series of mechanisms
with respect to photosynthetic apparatus efficiency
to protect themselves from adverse environmental
threats.
کلیدواژههای انگلیسی مقاله
Altitudinal gradient, Carotenoids, High-altitude plants, Photochemical processes
نویسندگان مقاله
| Zahra Mottaki
Department of Biology, Payame Noor University (PNU), PO BOX 19395-3697, Tehran, Iran
| Ghader Habibi
Department of Biology, Payame Noor University (PNU), PO BOX 19395-3697, Tehran, Iran
| Abbas Gholipour
Department of Biology, Payame Noor University (PNU), PO BOX 19395-3697, Tehran, Iran
Lohrasebi Tahmineh | Tahmineh Lohrasebi
Department of Agricultural Biotechnology, National Institute of Genetic Engineering and Biotechnology, Tehran, Iran
Plant Molecular Genetics, Plant Bioproducts Department, National Institute for Genetic Engineering Tehran, Iran
نشانی اینترنتی
http://jispp.iut.ac.ir/browse.php?a_code=A-10-737-8&slc_lang=en&sid=1
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زبان مقاله منتشر شده
en
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نوع مقاله منتشر شده
پژوهشی
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